LOINCActiveBoth

LOINC Code 75944-9: Left eye Pupil reaction [Time]

75944-9 is a LOINC code used to identify Left eye Pupil reaction [Time] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Pupil reaction. It is commonly used with the system or sample type Eye.left.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Pupil reaction. It is commonly used with the system or sample type Eye.left.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Both

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • Left eye Pupil reaction [Time]
  • Pupil reaction
  • Eye; EYE.PX; Eyeball; L; L eye; LT; Occular; Oculis; Ophthalmologic; Ophthalmology; Ophtho; Ophthy; Optic globe; Point in time; QNT; Quan; Quant; Quantitative; Random; React; Rxn; Vision; Visual

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Left eye Pupil reaction [Time]L eye Pupil reaction [Time]Pupil reactionEYE.PXTimePtEye.left

Frequently asked questions

Code details

Code75944-9
SystemLOINC
Display nameLeft eye Pupil reaction [Time]
DescriptionPupil reaction
Short nameL eye Pupil reaction [Time]
ComponentPupil reaction
PropertyTime
TimingPt
System (specimen)Eye.left
ScaleQn
ClassEYE.PX
Example unitss
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.54
Last changed2.68

Part names

Pupil reactionTimePtEye.leftQnTime (e.g. seconds)Point in time (spot)Left eye

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

LOINC Code 75944-9 | HealthAssure